Normally an s but not the apostrophe.
The plural of the word piano is pianos. Most nouns have an S added to them to make them plural.
To indicate possession when a word is plural, you generally add an apostrophe after the "s" at the end of the word. For example, if you have "girls" as the plural form, the possessive form would be "girls'" (e.g., "the girls' toys"). However, if the plural word does not end in "s", you would add an apostrophe and then "s" to show possession (e.g., "the children's books" for the plural form of "child").
The word "deer" remains the same in both singular and plural form.
A suffix is an ending added to a word, like -ing added to ask in the word asking.A plural suffix is a suffix that turns a word into a plural (more than one). In English, the most common plural suffix is -s, as in cats, where the -s turns a singular cat into more than one.Another common plural suffix is -es, as in potatobecoming potatoes.
An 's' can be added with an apostrophe as a contraction for the word "is".For example: The equipment's in the cupboard. (The equipment is in the cupboard)An 's' should not be added to form the plural. Equipment is an uncountable noun.
The plural form photos is an exception to the rule that words which end with -o preceeded by a consonant have -es added to create the plural form.
A plural noun ending with an s is possessive if it has an apostrophe after the s (s'), for example, horses-horses' or parents-parents'.A plural noun that does not end with an s has an apostrophe s ('s) added to the end of the word, for example, children-children's or teeth-teeth's.
The plural noun is oboes - but you have only added an S to oboe, which does not end with an O.All musical terms that end in O are made plural by adding an S. (solo, solos)
The rule for plural possessive is to add an apostrophe after the ‘s’ when a plural noun ends in ‘s’, such as “The students’ books.” If a plural noun does not end in ‘s’, add an apostrophe followed by ‘s’, like “The children’s toys.”
my - mi(s) your (singular, informal) - tu(s) your (singular+plural, formal)/his/her/their - su(s) our - nuestro(s)/nuestra(s) (male/female to match what is possessed) your (informal, plural) - vuestro(s)/vuestra(s) (male/female as above) The (s) is added if what is possessed is in the plural
plural.
I hope you mean "stylo"; if you do, it's short for stylograph, the plural form of which is stylographs. I assume that the plural form for the shortened form would also be no more than an added S to the word.